Safety device for die presses



April 25, 1933. w. c. JAY

SAFETY DEVICE FOR DIE PRESSES 4660712 eye.

Filed May 15, 1929 6 0 u 0 i h 0 m WWW IPCIU M Patented Apr. 25, i my :AISTATFT-VS "Arron or vmemm I mew-sewer: roams PnEssEs "Application filed May 1 5,

moved from engagement" with; :the dies and returned to its normal position by a resilient stripper plate. The perforated web is somewhat difficult to handle and is aptto pile up between the die members and interfere with-the properoperation of the ma chine-' The web often'breaks and clogs the dies, causing damage to the stock and, in

some instances has caused breakage of the dies before. any irregularity of the operation of the machine hasbeenzdiscovered. Furthermore, serious trouble is sometimes caused by failure of the'sheet material to befed properly from the feed rolls over the dies. This may be causedby'defective stock, but-more frequently by failure of the stripper plate to lift the stock tclear of the dies; Failure of the stripper plate to func tion' properly may'be caused by a broken stripper plate spring, or by a raw edge or whiskeribeing pulled down betweenlthe dies andstripper plate as a result of the dies becomingrdull or slightly out of alinement. Y

Insuchinstances, on account of the/ire quency and relatively quick speeds and long distances that the stockis fedat each cycle of-thexmachine or res's, the-stock of sheet material Qmay dou le under the stripper plate and over the dies for several laps and build upa suflicient thickness of stock torre- It is an object of the invention to overcome these difiiculties and provide a mech-' anism which will disconnect the power and stop the machine automatically l if the sheet material is not fed or advanced properly through the machine;

Before explaining 1 in" detail the present" invention, it is to *be' understood that the the latter;

WIL AM- c..jnYQorrmLAnnLPrira, rEmvsYLvANIA, AssieivoR o SAlViTARY r1165,

.UCTS oommtATIoN or MERIomor:rHILADELrHIA, rEN NsY LvAN IAh,ooRroBgA- 1:;

1929; Serial No. 363,124. 1

invention is not its the details of construction and. arrangement of parts illustrated in the vaccompanying drawing, since the invention is capable "of other embodiments and of being {practised terminology employed herein is for the pure 7 pose of description and not 01: limitation, and it is not intended to limit the invention 7 beyond the terms of the several claimshereto appended as considered lI l YleW Of lih'Q prior art and the requirements"thereofi i The invention will be more clearly under stood from the following. desoription'in Zion unction with the. accompanying drawing;

which is adiagrammatic elevati'onal view of i a machine embodying the"invention.- f; While the inventionisgapplicablei to idie presses and similar machines offaflwide :-va-

.7 riety of forms and types, it is herein shown for illustrative purposes as applied to l a press for blanking out and formingiplates from a web of paper stock. The frameof the press illustrated "comprises' 'Tlia: suitable tween them the bed 12 and having-guides; 13 for the cooperating ram 14; *Thefcom plementary upper and -'lower combined are carried by theram and'bedirespectively,

the lower dies 16 having associated therewith the usual spring supported-"stripper plate 17.- The main" operating shaft l8 qof the g is press 'is""jo urnalled in the uprights ll jand is provided with suitablej means iforreciprocatingthe'ram' 14- in theguide's l3 towa rd springs 22 connecting the ram with a cross head 23 i suitably supported from the "frame side members 11 above "theupperends' of to p upwardly-from the ram,-said=*"cam follower being held in engagement with said oamby' The stock, in the; form" a; web iw er paper or other" electrically non-conductive material, 'is ;intermittently fed between the .dies mechanism herein shown asfaipair e or carriedcout in various? waysfAlso' itis a to be understood that the f phraseology or p i5 base'lO and sideuprights 11 supporting be: r 1

1 shaft' fi8j ilfcludeaclutch 3.5 operated by. a.

I clutch sforkz36'wvherehy the shait .18 may be, connected with land disconnected from its he other arm of. whichl is connected'hya .reid or 'li'nkl 38 Witha vtreadle oroperating j ,1ever 501suitably pivoted at 5'1tothe-base f 1 Eire 14, the '-.-ar1' angement being. such that as the ram rises'away from the zbedthe'web will" be 'advancedand as said ram descendsztoward the bed theweh will remain stationi l'icb' p rat n a tigrbflnd {The Web Wof. sheetniatei between. the dies likewise'passes between the .rarnll .and-c0ntact7O5 the latter beingjso located thatfthe'scrap portion :of the perg forated.jgebgoyerlies or passes over the same as it isfed out of th'e machine.

inga pulley 30 'to which powerirom any suitablezsource may be transmitted 7 through a :belt fiil and a second pulley .32 connected byia 3 with .a pulley .34 on the shaft 18'. The lpoizver; transmitting. connections. between. the" pulleys 30 'andq82 ithroughuthe Zsou nce 1 :of power. 331116 clutch ifiork 36 1is v lflgof-the gfnamar 'Ihe treadle' is normally'fheld by .;a ;spring- 52 in the elevated positionshown in .dotted' lineslto cause'the QlirtchjorkBGto releasezthe clutch 35, the1 efiby disconnecting the shaft 18 from its... source 'of-1powerandastoppingthepress. j When depressed'ginto zthe 11311 line positi on the tneadle 5.0: operates 1 through the connections def 'scrihedzto. close the clutch 35, thereby eon j' nejcting t'he shaft" 1 8. with its source ofpower endearing-1cm press; :Said ztreadle maybe t mvtheegpressain operation .by toggle53 name;

i anism he einai te desc ibed the partsabove f red to specifica ly -m rt o 7 men's; lngaccordance withthje presentinvention, m ans are provided Y for. automati-j eally 'wnuloqking. the *treadle. or openating purpose aslillust tated, a solenoid is podjac t-the toggle .53andjhasiits Plflnger56-surnounded y-w ndings 167cm" groundedto the frame. The conductori68 i 'an insulating"hlockjfi iifiednin the stripper plate 17- The contact'70 is 'arranged'to cog operate with the ram' l i w hichconstitutesa 7 'i uita-hle inean'sarei provided for applying" power to the. shaft 18' to rotate the same,

' said. means as shown comprising a pgw shaft 28 journalled in brackets 29 carried-by theframe uprights ll,"said;p ower shaft hay;

1116.6. 011: :one farm. of' the bellv crank 37'. 1

ept. as hereinafter out; or as they'en ei' into mbin tion-with th ma h-'- resent invention and; i may he or; 1 usual-- or, sui;table construction and arrange.- 7 -59.

ablefdie memb'ers' for I g x I 'fromsheetmat'eriaL-meansforcfeeding sheet. lugs :60 qnnected an electric circu t line? .A p unger 12 enclosed, :by the nee ted in an electriealcircuit of relatively;

low potential, such as'a '12 volt line, including conductors 68 an'd80, the latter being is. connected with a contact 70 .mountedgin its passage 7 jlinesgtoiock thelever: 50 in pperatirreposi- 7 ti 0n. Rotation; of; the -sh'afltzils" *acauses ram 14 to move toward and awayiztronnthe .l bed, thus causing the.dies lfitandilfi tio tldlank out and form: article's; tro n theasheetmatee rial. The ram's.:at eachadownward irstmke depresses the: stripper plate 17 vzthrou=ghtlzie interposed Web. and theretore tendsi me n r gagethe contact 70, abut-Esfo long asjtheper forated portion of: theft-web rein'a-insiiintaet and is :being properlyy 'fed out :of. the. ma: chine it preventssaicl ramiarid contact from being brought into engagement- {i If for may 7 :99

reasonthe-web .W hecames brokenkor d1 placed, or otherwise viiails. to ah ited or; .at11

vanceol aiter" the last blanking out,-z the1contact 70 is Cengaged'iby the-mm ias the'ilatter is moved'atowardsthe bed, thus completing contact 70; ram, andr-frame andienergitingl the windings. 67 to"closeg'theteontaqt1365: f Upon closing the; tcont actlfifl the{solenoid windingBO is energized to move the-plunger 62 againstathe toggle 5.3iand' moveitke iatten from the full .line 'position toithe dotted dine position,"whereuponthe spring523=moes the I I lever 50 to its inoperative position land ld i's 1 1 engages the clutch 35,zthereby stopping the 11: 1 7 .machine'; '7 v i I leasing; 1. 5141111 a machi'n'eg'hav g relatively .istampi ng articles material between. said nemesis,

for relativelymoY-ingii'saidmeniheistowardfl and away from-eachiother and meanszlfor starting. and'stopp ing esaid ohamism f0he combination1thereWiat h. of; stripper .plate yieldingly-i nounted on client. aidzdiefmema hers; I mechanism. for; automatically 1' actuat ing said last-namedmean to step the-wni-a-i chine. including. an electric lly wa me i fir ee d d iceiewing an:

contact carried in an insulated mounting in said stripper plate and a conductor connected to the other die member. 7

2. In a machine having relatively mov able die members for die stamping articles from sheet material, means for feedingsheet material between said members, mechanism for relatively moving said members toward and away from each other, and an operating levermovable for startin and stopping said mechanism, the combination therewithof resilient means normally holding said lever 1n an lnoperative posltlon, means for lock lng said lever 1n an operat ve position, an

sheet material, means for feeding sheet mate- V rial between said members, mechanism for relatively moving said members toward and away fromeach other, and an operating lever movable for starting and stoppingsaid mechanism, the combination therewith of a resilient means normally holding. said lever cally moving said toggle to unlock said lever in an inoperative position, a toggle adapted to lock said lever when moved to an operative position, and mechanism for automatiincluding means ma ntained inoperative'by the web of sheet material adapted to be actuated by failure of said web to be advanced. 4. In a machine having relatively movable die members for die stamping articles from sheet material, means for feeding sheet material between said members, mechanism for relatively moving said members toward 3 and away from each other, and an operating lever movable for starting and stopping said i mechanism, the combinationv therewith of resilient means normally holding said lever in aninoperative position, a .toggle'adapted to locksaid lever when 'moved to an op-.

erative position, mechanism for automaticale e 1y moving said toggle to. unlock saidlever including an electrically actuated device, a V circuit through said device having spaced, I

contacts adapted to receive therebetween the web of sheet material, and means for bringingsaid contacts into engagement upon failure of said web to be advanced. V e In testimony whereof I aflix my signature. WILLIAM C. JAY. 

